Open-OS Index

The Open-OS Index

The Freedom Index
for Operating Systems.

A public ranking that certifies how operating systems treat the people who own devices, the developers who build software, and the users who install it. Nine weighted factors across three axes — owner sovereignty, ecosystem freedom, technical openness — each grade backed by cited evidence.

Rubric v— Last updated — — systems

    How the rubric works

    Each operating system is scored 0–100 on nine weighted factors organised in three axes. The overall score is a weighted average that maps to a letter grade.

    Owner sovereignty 45
    Who controls the device, the software running on it, and the data it produces. Covers owner authority, software freedom, privacy, transparency.
    Ecosystem freedom 40
    Whether developers can build and ship — and users can install — without gatekeepers. Covers developer autonomy, app distribution freedom, device neutrality.
    Technical openness 15
    Open formats, documented APIs, portable data, hardware breadth. Covers interoperability and portability.

    The rubric is public and versioned. Every score links to primary evidence. Anyone can challenge a verdict by opening an issue or pull request on GitHub.

    Read the full rubric → How audits are run → Challenge a score →